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After a few more checks, the engine was ready to fire up. Jeff set the timing and then let the engine run, varying the RPM from 1,500-2,500 until it came up to operating temperature. Since this engine has a roller cam and valvetrain, the break in procedure is a little less intense compared to that of a flat tappet cam. After the engine came up to temp, he shut if off and made another round of checks, looking for leaks and so on. We were good, so after the engine cooled down he fired it back up, brought it up to 2,000 RPM and then added load with the dyno. This will up the cylinder pressure and use it to force the rings against the cylinder walls helping to seat them. Then it was time for the first pull, which Jeff stopped at 4,000 RPM just to see how the engine liked the timing and jets. With factory-installed 75 primary and 80 secondary jets in the Holley, and 32 degrees of total timing the engine laid down 339 HP and 446 lb-ft of torque at 4,000 rpm. We decided to take the next pull to 5,500 RPM.